Losing a ton of chlorine

koivet

Member
Jul 11, 2021
14
Canyon Lake, TX
Yesterday at 7 p.m. my FCL/TCL was 8.1 (using LaMotte ColorQ Pro 7). My CYA was 47. This morning at 10:30 am my FCL/TCL is 2.13! How is it possible for chlorine to be reduced so much during the night?
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
44,347
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Algae or test error.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
44,347
Laughlin, NV
Pool Size
6000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
I would suggest you follow the SLAM Process if you had visible algae.

You need a FAS-DPD test kit for the SLAM.
 
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